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A form of macrocytic anemia in young females characterized by marked reduction in hemoglobin and a greenish skin color.
(plant pathology)
A disease condition of green plants seen as yellowing of green parts of the plant.



a plant disease in which the formation of chlorophyll in the leaves is disrupted and photosynthetic activity is decreased. Characteristic symptoms are premature yellowing and falling of leaves, formation of dwarf leaves, desiccation of shoot apices, and dying off of active roots. Among cultivated plants, fruit and berry crops and ornamentals are most often affected.

The causes of chlorosis are varied. Infectious chlorosis is caused by viruses (for example, raspberry chlorosis and apical chlorosis of tobacco and makhorka), fungi, and other microorganisms. Pests, such as thrips and aphids, are often the carriers of the causative agents of chlorosis. Noninfectious, or functional, chlorosis develops because of unfavorable soil or climatic conditions or because of inadequacy of cultivation practices. In most cases, fruit and berry crops (especially grapes) on carbonate soils suffer from ferrous or calcareous chlorosis. Zinc and magnesium chloroses also occur. A distinctive kind of yellowing occurs on diseased plants: spots appear, and at first yellowing appears only on the lower or upper leaves or only in the intervenous areas. Hereditary chlorosis of plants (variegation, gold-leafedness) is mutagenic and inherited; it is used in the selection of ornamental plants to develop variegated forms.

The prevention of chlorosis entails the application of mineral and mineral fertilizers. Carbonate soils are acidified, interrows of orchards are mulched and planted with ground cover, and pests that are carriers of infection are destroyed. Treatment of noninfectious chlorosis involves applying deficient nutrient elements close to the active zone of the root system and administering nonradical dressings and injections of solutions containing trace elements into the trunks, branches, and roots of fruit trees. Plants suffering from infectious chlorosis are removed.


Dement’eva, M. I. Bolezni plodovykh kul’tur. Moscow, 1962.
Shpota, L. A. Khloroz rastenii v Chuiskoi doline i bor’ba s nim. Frunze, 1968.
Nakaidze, I. A. Pochvennye usloviia i khloroz vinogradnoi lozy v Gruzii. Tbilisi, 1969.


References in periodicals archive ?
truncata in the glasshouse were observed to emerge and die, or were stunted and chlorotic (Syme 2005).
This chlorosis becomes more intense and extensive with prolonged exposure until the midrib and some veins appear as a green arborescent pattern on a chlorotic background.
Ferric reduction by roots of chlorotic bean plants: Indication for an enzymatic process.
These formulations can supply micronutrients to deficient agricultural areas such as chlorotic citrus groves.
The strip test can detect the presence of the pathogen at the very early stages of infection, from chlorotic lesions (before formation of a pustule) to immature pustules (not releasing spores).
Initial symptoms of IYSV infection appear as chlorotic, elongate ringed lesions on leaves and flower scapes (Gent et al.
Symptoms of the syndrome can vary, but leaves of affected plants often develop chlorotic (yellowing) and necrotic (dead tissue) speckling that can progress to total leaf necrosis.
Once established the shrub provides garden interest for at least three months from the end of March, firstly smothered in drooping bunches of small, white pitcher-shaped flowers, not unlike lily-of-the-valley, followed by crimson young growths, fading to crimson pink, through pale yellow, to chlorotic green, turning deep green by early summer.
Other plants in this Sherman Oaks landscape, together with tips on growing them, include: Australian rosemary (Westringia), a relative of ordinary rosemary (Rosmarinus) with gray green foliage and white or lavender flowers that are on display all year long; fortnight lily (Dietes), clumps of spear-shaped leaves that are frequently chlorotic and are fortified by regular application of iron sulfate or Ironite fertilizer; bronze-leafed hopseed bush (Dodonaea), a very short-lived perennial; needle-leafed and spidery-flowered Grevillea, which dies when fertilized with phosphorus; blue oat grass (Helicotrichon sempervirens), a fountainesque grass more interesting and durable than blue fescue but more water needy than the other plants in this landscape.
Treat chlorosis If leaves on camellias, citrus, and gardenias look chlorotic (yellow mottling between green leaf veins), the plant may have an iron deficiency.
14 days old) as decreased leaf fluorescence appeared as visible damage (long chlorotic spots starting from the leaf tip) on 21- and 28-day-old seedlings.